Gold & Silver - Department of Energy

the mineralogy of the ore, but range as high as several hundred degrees Celsius. Roasting of carbonaceous ores oxidizes the carbon to prevent interference with leaching and reduced gold recovery efficiency. Autoclaving (pressure oxidation) is a relatively new technique that operates at lower temperatures than roasting.

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This assures a rapid interface between the carbon and the gold loaded cyanide solution. Granular, hard carbon is used, in the size range of 10-16 mesh. The carbon is then removed by screening, across a carbon screen, allowing the liquid and finely ground ore (-100 mesh) to pass through easily, and retaining the carbon on the screen.

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The plant is a conventional CIL (Carbon In Leach) plant with a capacity to process about 340,000 tonnes per year of Charters Towers gold bearing ore. There is also a substantial gravity gold recovery circuit planned to be installed within the overall plant design to recover the coarse gold particles.

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Ore processing is a 24 hour operation. Ore is stockpiled (1) at the processing plant, and the process begins by feeding the ore into a hopper with a loader. The ore is conveyed, and lime is added (2) to raise the pH of the ore.

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Design Criteria . In the carbon-in-pulp process activated carbon is mixed with a ground ore plus water slurry in which gold and silver cyanides are dissolved. After the precious metals are adsorbed onto the carbon, the loaded carbon is separated from the pulp and stripped.

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the ore prior to smelting, particularly for lower grades of ore. Biringuccio does ... Furnace Design Once the ore has been mined and crushed to a powder, it is placed in a furnace to ... 6 For sufficiently pure silver and gold in quartz, amalgamating with mercury was preferred over smelting.

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